An efficient and convenient method was developed for the formation of S-substituted thiotriazoles through an unprecedented organometallic addition and subsequent ring-opening sequence of 3-substituted [1,2,4]triazolo[3,4-b][1,3,4]thiadiazole. The method is applicable to a wide range of substrates containing different functional groups and furnishes excellent yields of the corresponding N-unsubstituted
Tautomerism of aza cycles: I. Structure of 3(5)-butylsulfanyl-5(3)-methyl(phenyl)-1H-1,2,4-triazole tautomers in crystal. Preference of the 3-RA-5-RD-1H-tautomer of 3(5)-mono-and 3,5-disubstituted 1,2,4-triazoles
作者:B. I. Buzykin、E. V. Mironova、V. N. Nabiullin、A. T. Gubaidullin、I. A. Litvinov
DOI:10.1134/s1070363206090209
日期:2006.9
The X-ray diffraction study of potentially tautomeric 3(5)-butylsulfanyl-5(3)-methyl-1H-1,2,4triazoie and its 5(3)-plienyl-substituted analog showed that these compounds in crystal have the structure of 3-butylsulfanyl-5-methyl(phenyl)-1H-tautomers. Analysis of our experimental and published data indicated that 3(5)-monosubstituted 1,2,4-triazoles and 3,5-disubstituted derivatives having nonequivalent substituents in crystal as exist as a tautomer in which the electron-acceptor substituent (RA) occupies the 3 position, while the electron-donor substituent (R-D) resides in the 5 position, i.e., as 3-R-A-5-R-D-1H-1,2,4-triazoles. Symmetric 3,5-disubstituted 1,2,4-triazoles could give rise to tautomeric equilibrium between the 1H- and 2H-structures even in crystal.